In the industrial automation industry, I believe that most of them know the automation product plc. Unfortunately, about Siemens plc, how much do you know? This article is to explain the working principle and operation process of Siemens PLC.
The central processing unit is the nerve center of the normal operation of Siemens PLC. When the PLC is put into operation, it firstly accepts the status and data of each input device in the field by scanning, and separates it into the I/O image area, and then from the user order memory. The user sequence is read one by one, and after the instruction is explained, the result of the instruction execution logic or the management operation is sent to the I/O image area or the data register. After all the user's sequential performance ends, the output status of the I/O image area or the data in the output register is finally transferred to the corresponding output device, and the operation is cycled until the operation is stopped.
Followed by the memory. The memory is called the system sequential memory of the registration system software; the memory that registers the application sequence is us as the user into the coarse memory.
The third is the power supply. When the PLC is put into operation, its operation process is usually divided into three periods, namely, input sampling, user sequence fulfillment, and output rewriting. The above three periods are called a scan cycle.
Siemens Automation Products PLC is a professional computer used in enterprises, the full name is programmable controller. When the Siemens programmable device is put into operation, its working process is usually divided into three phases, namely, input sampling, user program execution and output refresh. Completing the above three phases is called a scan cycle. During the entire operation, the CPU of the PLC repeatedly executes the above three stages at a certain scanning speed.
Semiconductor Parts
Semiconductor Parts
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